html,
body{
    margin: 0;
    padding: 0;
}

* {
    box-sizing: border-box;
}

a {
	text-decoration: none; /* 去除默认的下划线 */
	outline: none;	/* 去除旧版浏览器的点击后的外虚线框 */
	color: #000;	/* 去除默认的颜色和点击后变化的颜色 */ 
}

#bim {
    position: fixed;
    top: 0;
    left: 0;
    margin: 0;
    padding: 0;
    z-index: 0;
}

#root {
    margin: 0;
    padding: 0;
    z-index: 100;
}

.sight {
    width: 26px;
    height: 26px;
    content: url('../image/sight.png'); 
}